Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities - Schedule of Marketable Securities (Detail)

v3.19.1
Marketable Securities - Schedule of Marketable Securities (Detail) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]    
Marketable Securities, Amortized Cost $ 16,266,593 $ 22,162,236
Marketable Securities, Unrealized Gains 1,114 860
Marketable Securities, Unrealized Losses (78) (31,160)
Marketable Securities, Fair Value 16,267,629 22,131,936
Corporate Debt [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Marketable Securities, Amortized Cost 13,265,522 19,179,530
Marketable Securities, Unrealized Gains 732 314
Marketable Securities, Unrealized Losses (78) (31,160)
Marketable Securities, Fair Value 13,266,176 19,148,684
US Treasury Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Marketable Securities, Amortized Cost 3,001,071 2,982,706
Marketable Securities, Unrealized Gains 382 546
Marketable Securities, Fair Value $ 3,001,453 $ 2,983,252